[Chip753]

I think that I have to read the thread about ante stealing cause this hand was probably related to it.
The fact is that the villain was playing in iper-aggressive way, try to steal every possible pot. I don't know exactly why but I had the feeling that he was not so strong as he wanted to show me (in a certain way I was sure he had something above 9)
The end is that: his hole cards were [Th 4s] and he cought a [2s] on the river!

It is interesting what you wrote about the fact that he had nothing to gain gambling against the short-stacker [a new thing about I should think more when I play]: the fact is that what he did was pretty silly........ in other words [Scotty's words], that's freeroll baby!

Now, I would like to understand if my feeling was a great thing or a stupid way to gamble against a guy that could be in a better position than me.

About completing, it is your second choice: the first one was all-in and he did not complete cause he had not a full bet.